[Phil @ Extreme Clean]

looks good on the video but seems quite expensive and £75 + vat to run it for 8 hours and how safe is the chemical on carpets?

[Intelligent Surface Solutions]

Perfect - The "chemical" is a surfactant derived from Sugar beet so as such is a non-classified product (Very green/eco friendly) - When you break it down it works out to be less than 3p a blob -  a lot cheaper than a freeze spray - Only thing is make sure you use the nylon head on carpets - Brass ones will cause damage (Teaching you how to suck eggs i know!)